Preparation

With processor running, drop garlic through feed tube and mince. Scrape down sides of bowl. Add roasted pepper, vinegar and cayenne and process until mixture is almost a smooth purée. Add 1/4 cup mayonnaise and process using on/off turns just until combined. Transfer sauce to a small bowl; mix in remaining 1/4 cup mayonnaise. Season to taste with salt and pepper. Cover and refrigerate at 30 minutes. (Can be prepared 1 day ahead. Keep refrigerated.)

Place dip in center of platter. Arrange vegetables around dip and serve.